Ok, after all I have been though with my truck in the last 3 weeks here is a update.

Truck was running rough one day. Bad idle. I put in new 80 HP injectors, over flow valve and new rubber fuel lines. Still rough idle. Then I had the timing checked and it had slipped. Had the rear of the IP rebuid. IP back in and timed at 15.5. Still a little rough. Shop finds bent push rod tubes. New tubes installed runs better but still a little rough. Then discover blown head gasket. Leak down test finds # 3,5,and 6 cylinders are bleeding down. They also show me with a solution in #3,5 and 6 that the cylinders are leaking down.

Shop says bad/cracked rings caused from over fueling?? Possibly from installing 80 HP injectors and not bumping up the timing??? (But same probelm before I installed the injectors) At only 197,000 Time for a rebuild..... I say put head back on and I am going to run it till it won't run anymore.....

Any thoughts? I am still moving forward with the head re install. Truck was running fine other than the miss at idle and occasional white smoke. But with timing adjusted, new pushrod tubes and valves adjusted and new head gasket I think I good for another 100K

I plan on building a 500 HP plus 12 valve. So if this motor is on its way out, it is going to have to prove it to me.....

Dave

 

If you have cracked rings etc... not sure it'd be a great idea to put the head back on and drive......

I know it's not what you want to do but probably time to rebuild or swap motors.....

Did they do a compression test?? What is the blow by like?? Oil consumption?? Oil analysis......

 

I did not get the numbers on the compression leak down test or compression test. Oil consumption is normal. Oil looked good not milky or white. Truck has plenty of power and was driving fine other than the rough idle.

So if it is not craked rings what else would cause leak down?

 

If they put liquid into the cylinders , then re did the leakage test and it STILL LEAKED down, then it is something above that, IE HG or valves.

 

JKM from what I understand they did a compression test which told them they had a bad head gasket. Once the head was off and they went to clean up the block for the re install of the head and some how came up with the rings are broken on 3, 5, and 6. I could understand if the rings where washed out a bit. But not broken. 3 things that where already found out:

Bad head gasket

Leaking IP pump

And bent push rod tubes

Head and valves already checked out fine.....

 

Runner till its dead!!!!!!!!!

 

How would they know the rings are broken unless they raised the engine , dropped the pan and pulled each hole apart to inspect, i don't think #5 and #6 would even come out in the truck?

If they DO have the head off , and somehow they prove the rings are broken, now would be the time to pull those cyls out and re ring them, if you can't get "6 all the way out , it should come out far enough to slip new rings on at least...


Sounds to me like you just had a bad HG.

Did they do a compression test , or just a leakdown?

 

They performed a compresion test and found out that I had a bad HG.

Then after the head was off they poured diesel or some other type of fluid into the cylinders. Rotated the motor and watched to see if the liquid would leak down past the rings? Does this make sense?


Thanks guys. Shop has had my truck for 3 weeks. I am sick of all the bull shiz nit......

I need to hear that 12v again. I am having cummins withdrawls.

Dave

 

If you go ahead with the rebuild be sure you replace those plastic oil cooling nozzles with steel ones.

 

I don't believe that's how a leak down test is performed. If thats what they did and the liquid didn't stay in the cylinder thats probaly normal.All the rings have slight gaps in them that would allow liquids to to slowly seep past. A leak down test works something like this, first you fill the cylinder with compressed air and then rotate the engine slowly and watch to see if the presure drops at on certain point, if it does then you have a bad cylinder. As for the rough idle you could have an air leak in a number of places. You said you replaced the ruber lines, but you should also check the condition of the hoses and conections at the tank. Good luck, Darl Absher III

 

Thank everyone for the help. I honestly think the shop is just full of it. They did find some genuine issues with my truck. But I also think they are trying to make some extra cash to pay payroll....

>>> This is exactly what I was thinking. I also told the mechanic that the 3 cylinders that did not leak down with diesel sitting in them could have very tight gaps in the rings. Thus causing little to no leak.....

Anyway....... I'm going to drive it like I stole it... With only 197,000 on the clock and not to heavily moded. My truck has barely been broken in....

Thanks again everyone.....!!!

 

Rings on cylinders are fine. Mechanic did fluid test 3 times again during business hours today. No leak down at all. Must have been some dirt in the cylinders around rings from the head removal. Also found out that my motor has been rebuilt before. Head is from a 96 with much larger valves than stock. And motor has been decked from the run out test on the pistons. Hatching on cylinder walls looks very fresh.

Head had some scoring in between each cylinder allowing cylinders to share pressure. That was fixed and is ready to bolt on

Just waiting on head gasket.

Should be running really good very soon.....

Very strange the motor has been previously worked on and truck is only showing 197,000 on the clock

Dave

 

Sounds like the shop was giving you a little run around there , put that head back on and forget them, as stated before , that is NOT a leak down test, your cylinders and pistons are fine , get a new HG and start bombing. Not trying to spend your money , but if you want to go heavy on the bombs , now is the time to o ring and stud that head.

 

JKM explain what needs to be done to o ring the head?

Thanks....

Dave

 

Basically they machine a little groove around each combustion chamber , and there is a wire "O-ring" that goes in there, then you put your head back on. It helps the seal the headgasket against higher cyl pressures from more fuel/boost/turbo drive press/ etc.

As far as the cost , i have no idea , i have never had it done, my stock HG is still holding.